JPH0479706A - Enclosed switchboard - Google Patents

Abstract

PURPOSE:To reduce the area of installation by a construction wherein a maintenance chamber in the longitudinal direction is provided for an enclosed switchboard, while a partition wall having a window with a door for inspection is provided between a machine chamber wherein breakers are stacked in many stages and a cable chamber and a bus chamber which are located on the rear side of the machine chamber. CONSTITUTION:A maintenance chamber 12 in the longitudinal direction is provided for an enclosed switchboard in such a manner that it can be accessed by opening a door not shown in the figure. Machine chambers 3a, 3b, 4a, 1a to 1d, 34a and 34b accommodating receiving breakers 3A and 3B, a bus breaker 4, feeder breakers 1A to 1D, PT 34, etc., are stacked in many stages on the opposite sides of the maintenance chamber. On the rear side thereof, a space for accommodating a vertical bus 6 and a cable not shown in the figure is formed. Partition walls 17 are provided between the maintenance chamber 12 and the machine chambers and between that chamber and the chamber for the bus and the cable. Inspection windows 13 to 15 having opening-closing doors are provided in necessary places of the partition walls 17 and the states of connection of a bus disconnector 5, a cable disconnector 7, each breaker, etc., are checked up therethrough. A communication bus is checked up by opening a base plate 28B of the maintenance chamber. According to this constitution, spaces for maintenance before and behind the switchboard are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a closed power distribution board in which a power receiving circuit breaker and a power supplying circuit breaker are housed.

(Prior Art) In Fig. 12 showing a main circuit single-line connection diagram of a two-line power receiving facility, the load side of the No. 1 power receiving transformer 31A whose negative side is connected to the power supply side is connected via a cable head. A current transformer 32, an ammeter 32a, etc. housed in a closed power distribution board for receiving power (hereinafter referred to as a power receiving board), which will be described later, are connected, and a current transformer 33 and a power receiving circuit breaker 3A of the No. 1 system are connected in order. There is.

On the other hand, the load side of the power receiving transformer 31B, whose negative side is connected to the power supply side of the No. 2 system, is also connected via a cable head to current transformers 32, 33, ammeters 32a and 2, which are housed in a power receiving board, which will be described later. Nine power receiving circuit breakers 3B of the system are connected to each other, and a busbar communication circuit breaker (hereinafter referred to as a busbar circuit breaker) is connected to the load side of these power receiving circuit breakers 3A and 3B.

In addition, a fuse 2 is installed on the load side of the power receiving circuit breakers 3A and 3B.
Main circuit auxiliary equipment such as a voltage transformer 34 is connected to the secondary side of the voltage transformer 34, and a voltmeter 38 is connected to the secondary side of the voltage transformer 34 through a changeover switch 37.

Similarly, on the load side of the power receiving circuit breakers 3A and 3B, the power feed circuit breakers IA and IB are installed in the No. 1 system, and the power feed circuit breakers I are connected to the No. 2 system.
C, ID are connected respectively, and these power supply breakers 1.
A, ], B, A current transformer 35 is installed on the load side of the IC and LD.
A and 35B are connected in order. Among these, an ammeter 35a, an overcurrent relay, a ground protection relay, etc. are connected to the secondary side of the current transformer 35A, and a voltage wire is connected to the secondary side of the current transformer 35B. A current coil of an integrating wattmeter 36 connected to the secondary side is connected.

Next, Figure 13 is a layout diagram of a closed power distribution board in which the equipment of the power receiving equipment connected as shown in Figure 12 is housed in a box, where (a) is a front view and (b) is a The same figure (a) is a CC cross-sectional view, the same figure (c) is a D-D cross-sectional view of the same figure (a), and the same figure (d) is an E-E cross-sectional view of the same figure (a). be.

In Figures (a) to (d), on the left side of the busbar connecting board 52 installed in the center and housing the busbar circuit breaker 4 inside,
An auxiliary equipment panel 53A in which the No. 1 instrument transformer 34 is housed is adjacent to the duct panel 52a, and on the right side there are 2
Auxiliary equipment panel 53B in which the instrument transformer 34 of the No. 1 system is housed
is located next door. Among these, adjacent to the left side of the auxiliary equipment panel 53A are a No. 1 power receiving board 51A in which the No. 1 system power receiving circuit breaker 3A is housed, and power feeding boards 54A and 54B that house the power feeding circuit breakers LA and IB, respectively. Similarly, on the right side of the auxiliary equipment panel 51B, there is a No. 2 power receiving board 51B in which the No. 2 system power receiving circuit breaker 3B is housed, a power feeding circuit breaker IC,
Power supply boards 54C and 54D each housing a power supply unit 10 are arranged adjacent to each other in order.

A substantially U-shaped communication busbar 8 whose upper end on one side is connected to the lower pole of the busbar circuit breaker 4 is arranged between the busbar communication panel 52 and the duct panel 52a, and the duct panel 52a and the adjacent busbar 8 on the left side thereof are arranged. A horizontal busbar 6A whose right end is connected to the communication busbar 8 in the duct panel 2a is installed between the upper parts of the installed auxiliary equipment panel 53A and No. 1 power receiving panel 51A and the power supply panels 54A and 54B. The bus 6A includes the primary side of the voltage transformer 3.1, the power receiving circuit breaker 3A, and the power supply circuit breaker IA.

The upper pole of IB is connected with a conductor. On the other hand, a power receiving transformer 3 is connected to the lower pole of the power receiving circuit breaker 3A via a cable head.
] A cable 22 is connected to the secondary side of J, and a cable (not shown) connected to a load (not shown) via a cable head is connected to the lower poles of the power supply breakers LA, LB.

Similarly, the busbar communication board 52, the auxiliary equipment board 53B installed next to it on the right side, the No. 2 power receiving board 51B, and the power supply boards 54C, 54D.
A horizontal bus bar 6B is installed between the upper parts of each of the horizontal bus bars 6B, and the horizontal bus bars 6B are connected to the primary side of the voltage transformer 34 of the auxiliary equipment panel 53B, the upper part of the power receiving circuit breaker 3B, and the power supply circuit breaker IC, ID. The poles are connected to each other. On the other hand, a cable 22 that is connected to the secondary side of the power receiving transformer 31B via a cable head is connected to the lower pole of the power receiving circuit breaker 3B, and a cable 22 (not shown) is connected to the lower pole of the power feeding circuit breaker IC, 10. A cable (not shown) connected to the load is connected via a cable head.

Next, in the same figure (b), the horizontal busbar 6A at the rear of the power supply board 54B and the cable breaker 7 connected to the lower pole of the power supply circuit breaker IB are separated by an inverted partition plate. , power supply board 54B, power receiving board 51A, 51B and power supply board 54C,
54D is also provided with a partition plate in the same way, and in the busbar communication board 52, the horizontal busbar 6B and the communication busbar 8 are partitioned as shown in FIG. As shown, there is no partition plate, and pressure relief plates 13, 14, and 15 are provided on the ceiling at the upper end of each partitioned room. If a phase-to-phase short circuit or grounding accident occurs in the circuit breaker room or busbar room and the internal pressure rises, the pressure relief plates 13, 14, and 15 will open, causing maintenance staff to Damage to others is kept to a minimum.

By the way, in a closed switchboard configured in this way, if you want to inspect the internal devices and connections during periodic inspections, open the front door and insert the bow-shaped circuit breaker etc. The box body is lowered onto the front maintenance surface 41 shown in FIG. 5B, the unillustrated door on the back is removed, and the inside of the box is entered through the maintenance surface 42 shown in FIG.

However, among recent power receiving equipment installed in buildings, there is a demand for front-maintainable types that can be installed so that the back side is in contact with the front wall of the building, but the interior can be inspected and maintained. There is a tendency to Moreover, the installation floor area is also required to be smaller and smaller.

(Problem to be solved by the invention) However, in a closed switchboard configured in this way, the circuit breaker room can be inspected from the front, but the bus room and cable room must be inspected from the back. In addition to the maintenance surface 41 on the front shown in Figure (b), a maintenance surface 42 is also required on the back, and when inspecting the inside of the circuit breaker room, the interior cannot be seen unless the circuit breaker is lowered. A maintenance surface 41 is also required on the front, which increases the required installation floor space.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain a closed switchboard that can reduce the installation floor space.

[Structure of the invention]

(Means and effects for solving the problem) One of the present invention is to provide a closed power distribution board in which a power receiving circuit breaker and a plurality of power supply circuit breakers are housed in multiple stages, at least on one side of the front part of a vertically provided maintenance room. An equipment room is installed in which the power receiving circuit breaker and power supply circuit breaker are housed through a bulkhead, and a busbar room and a cable room are installed at the rear of this equipment room. By providing an opening with a door, each equipment room, cable room, and busbar room can be inspected from the maintenance room, thereby reducing front and rear maintenance and reducing the installation floor space. One is a closed switchboard in which a power receiving circuit breaker and multiple power feeding circuit breakers are housed in multiple stages, and the power receiving circuit breaker and power feeding circuit breaker are housed on both sides of the front of a vertically installed maintenance room via bulkheads. By providing a busbar and cable room at the rear of this equipment room, and providing an opening with a door in the partition wall between each equipment room, busbar room, cable room, and maintenance room, each equipment room, cable room, This is a closed switchboard that allows inspection of the busbar room from the maintenance room, reducing front and rear maintenance and reducing installation floor space.

(Embodiment) Hereinafter, an embodiment of a closed switchboard of the present invention will be described with reference to the drawings. However, parts that overlap with FIGS. 12 and 13 are omitted.

FIG. 1 is a front view of the closed switchboard of the present invention, which corresponds to FIG. 13, FIG. 2 is a right side view of FIG. 1 (with the side plate removed), and FIG. 1 is a sectional view taken along line A-A in FIG.

In FIGS. 1 to 3, the inside of the box of the closed switchboard is divided into concave shapes when viewed from the front, and the groove in the middle of the concave shape serves as a maintenance room 12. It has double doors and is equipped with meters, relays, etc.

On the other hand, on the left and right sides of this maintenance room 12, there are further partition plates 2 arranged in five upper and lower stages.
1, and on the right side there is a bus circuit breaker chamber 4a in which the bus circuit breaker 4 is housed at the lowest level, and the upper part of this bus circuit breaker chamber 4a is a power receiving circuit breaker chamber 4a in which a power receiving circuit breaker 3B is housed. The upper part of the power receiving circuit breaker room 3b is the auxiliary equipment room 34b in which the No. 2 system voltage transformer 34 is housed, and the upper part thereof is the power supply circuit breaker chamber 1 in which the power supply circuit breaker IC, 10 is housed.
c, ld.

Further, on the left side of the maintenance room 12, the second stage from the bottom is the power receiving circuit breaker room 3a, above that is the auxiliary equipment room 34a of the No. 2 system, and further above that is the power feeding circuit breaker room 1a, lb.

Further, at the rear of the left and right compartments, as shown in FIG. 2, a busbar chamber 24 is formed between the vertical partitions 18A, and a vertical busbar 6 is vertically disposed in this busbar chamber 24. A horizontal partition plate 16 is provided in the same way as each device t in front of it. The upper pole of each device in front thereof is connected to the front end of a bus disconnector 5 that is installed through the partition wall between each equipment room and the busbar room 24, and the rear end of this busbar disconnector 5 is connected to the busbar disconnector 5. As shown in FIG. 4, the power receiving circuit breaker 3A is connected to each vertical bus bar 6 via an L-shaped connecting conductor 19.

3B and the lower pole of the power supply circuit breaker are connected to the front end of a cable disconnector 7 which extends through the busbar chamber 24 in the front and back and has flanges at the front and rear as shown in FIG.

Further, the busbar breaker chamber 4a- and the rear busbar chamber 24 are provided with a partition plate on the side that partitions the vertical busbar 6 and the connecting busbar 8, and the right end of the connecting busbar 8 is connected to the busbar disconnector 5 through the The other end of the communication bus 8 is connected to the lower pole of the bus breaker 4 from within the bus duct with an inverted U-shaped cross section provided at the lower end of the maintenance room 12 to the above-mentioned vertical line (not shown) on the power receiving circuit breaker 3A side. Bus line 6
is connected to the bottom edge of the

On the other hand, in the cable room 10 formed at the rear of the partition 18A at the rear of the busbar room 24, a horizontal partition plate 18B is provided at a height above the middle of the power supply breaker rooms 1a and lc, so that the cable room can be accessed from the floor. Power supply circuit breaker], a,]
, c is provided with a cable support for supporting the cable 9 connected to the lower poles of the cables.

Further, an L-shaped partition plate 18C is provided at the middle lower surface of the horizontal partition plate 18B, and the upper end thereof also rises from the floor surface and is connected to the lower pole of the power supply circuit breakers 1a and lc via the cable disconnector 7. A cable sabot 1- for supporting the cable is provided, and an L-shaped partition 1.80 is also provided at the lower front of the cable room 29, and the power supply side cable room 25 formed inside this partition 1.8D includes: A cable 22 rises from the floor and is connected to the lower poles of the power reception circuit breakers 3A and 3B via a cable disconnector 7.

Furthermore, as shown in FIG. 5, each equipment room is provided with a shutter 20 that moves up and down in conjunction with the insertion and removal of each equipment to shield the front surfaces of the bus disconnector 5 and cable disconnector 7. There is. On the other hand, each of the partition walls 17 between the maintenance rooms 12 is provided with an inspection door 13 that also serves as a pressure relief plate, as shown in FIG. As shown in FIG. 5, an inspection door 14 that also serves as a pressure relief plate is provided, and a cable room 10, 11 and a maintenance room 12 are also provided.
An inspection door 30.15 that also serves as a pressure relief plate is provided on the partition wall 17 between the two, and a door 27 is provided at the lower end of the cable room 29 as a work opening for installing the cables 9 and the like.

Furthermore, a pressure relief plate 28A is also provided on the ceiling of the maintenance room 12.
A pressure relief plate 28B is also provided on the upper surface of the above-mentioned busbar duct that crosses the lower part of the busbar duct 4, and doors that open outward are provided on the front surfaces of the left and right equipment rooms and the lower busbar room 8a of the power receiving circuit breaker room 3a. The exterior is symmetrical when viewed from the front.

Now, in the closed switchboard configured as described above, when inspecting the connecting portions of the bus disconnectors 5 and cable disconnectors 7 in each equipment room, enter the maintenance room 12 and open the inspection door 13.

Similarly, when inspecting the connection between the busbar disconnector 5 and the vertical busbar 6 in the busbar room 24, open the inspection door 14, and when inspecting the connection between the cable disconnector 7 and each cable,
Each inspection is performed from the maintenance room 12 by opening the inspection door 15.

Also, the bus disconnector 5 on the lower pole side of the bus disconnector 4 and the connecting bus 8
When inspecting the connection to the main body, the pressure relief plate 28B is opened, and maintenance of the ammeter, protective disconnector, etc. is also carried out from inside by opening the door of the maintenance room 12.

In this way, each equipment room, bus room, and cable room are inspected.
All of this can be done by opening the inspection door that also serves as a pressure relief port provided in the bulkhead 17 on the maintenance room 12 side, so even if the closed switchboard is installed with its back against the wall inside the building, the interior can be inspected. This is a front-maintainable closed switchboard that can be maintained and inspected, reducing the amount of maintenance required before and after the installation, and reducing the installation floor space.

Furthermore, inspection of equipment on the low-pressure side is carried out in the maintenance room 12 inside the partition wall 17 separated from the high-pressure side, so it is safe.

Furthermore, from the inspection door 30 provided at the upper end of the cable room 10,
Since the upper end of the box can be fixed to the wall 26 of the building, for example, when the building is installed in a place where the ceiling of the building is high for an adjacent power receiving transformer or private generator, the equipment room can be fixed. Even if the number of stages is increased, earthquake resistance can be improved, and the installation floor space can be further reduced.

Next, FIG. 6 is a front view showing another embodiment of the closed switchboard of the present invention, FIG. 7 is a right side view thereof, and FIG.
It is a BB sectional view of the figure.

In Figures 6 to 8, the box body is formed in a concave shape when viewed from the front as in Figure 1, but the busbar circuit breaker 4 has the same width as the maintenance room 12 at the center of the lower end and is slightly taller. It is stored in the equipment room, and the power receiving circuit breakers 3A and 3B are stored in the equipment rooms on the left and right of the equipment room at a slightly higher position.

As a result, the auxiliary equipment rooms 34a and 34b are installed in the second stage from the bottom, and a new power supply breaker room 1e is also installed above the power supply breaker rooms 1a and lb at the top of the auxiliary equipment room 34a on the left side. Similarly, a power supply breaker chamber 1f is added above the power supply circuit breakers 1c and ld above the right side auxiliary equipment room 34b.

Furthermore, a connecting bus bar 8 bent into a substantially double shape is connected between the lower end of the left vertical bus bar and the lower pole of the bus circuit breaker 4, and similarly, the lower end of the right vertical bus bar and the upper pole of the bus circuit breaker 4 are connected to each other. A connecting bus bar 8 bent in a substantially Z direction is also connected therebetween.

Furthermore, the busbar chambers 24 at the rear of the left and right equipment rooms communicate vertically, and the cable chambers 10 at the rear also communicate with each other, and the busbar chambers 24 at the rear of the left and right equipment rooms communicate with each other.
4 and the ceiling of the cable room 10 is a pressure relief plate 31A.

31B is provided.

In this case as well, each equipment room is inspected from the maintenance room 12 through each inspection door 13, 14, and 15 provided in the bulkhead 17, and even when the load increases, it can be handled by increasing the number of power supply breakers 1e and 1f. Therefore, not only can the installation area be further reduced, but the front appearance and the arrangement of internal equipment, busbars, etc. are symmetrical, making it easy to understand and sharing parts, resulting in a closed power distribution board that is easy to assemble and maintain. .

Further, FIG. 9 is a front view showing another embodiment of the closed switchboard of the present invention, showing the case of three-line power reception.

In the figure, the inside of the box is shaped like a mountain with maintenance rooms 12 on the left and right with a central equipment room in between, and the lowermost equipment room is slightly taller, similar to Figures 6 to 8. and
Power receiving circuit breakers 3A are installed at the center and left and right ends.

3B and 3C are housed respectively, and the central power receiving circuit breaker 3
Busbar circuit breakers 4A are installed in the equipment room with the same width as the maintenance room 12 on both sides of B.
.

4B is stored.

Then, the upper pole of the central power receiving circuit breaker 3B, the lower end of the vertical busbar (not shown) at the rear thereof, and the busbar circuit breakers 4A on both sides thereof,
The connections between the upper pole of 4B, the lower end of the vertical bus bar at the rear of the left end equipment room, and the lower pole of the bus breaker 4A, and between the lower end of the vertical bus bar at the rear of the right end equipment room and the lower pole of the bus breaker 4B are as follows: Each is carried out using connection bus 8.

In this case as well, maintenance and inspection of each equipment room, busbar room, and cable room formed around the left and right maintenance rooms 12 is performed by opening the inspection door 13 provided in the partition wall 17 and the like.

Furthermore, FIG. 10 shows still another embodiment of the closed switchboard of the present invention, and shows the case of single-line power reception.

In this case, the structure of the box is the same as the two-line power receiving case shown in Fig. 6, but the power receiving circuit breaker 3A is located in the center of the lower end, the power feeding circuit breakers LA and IK are on the left and right, and the power feeding circuit breaker on the right side is the power receiving circuit breaker 3A. IK
An auxiliary equipment room 34a is provided in the upper part of the room, and the rest of the rooms are all power supply circuit breaker rooms, which can accommodate a total of nine power supply circuit breakers.

Furthermore, FIG. 11 shows yet another embodiment of the closed switchboard according to the present invention, and shows the case of single-line power reception, similar to FIG. 10.

In the figure, the first half of the lower end is a communication busbar room 8a, and the lower end of the rear vertical busbar 6 of the power receiving circuit breaker room 3a on the right side of the upper part and the lower end of the right vertical busbar 6 form a U-shaped connection. They are connected by a busbar 8, and partition plates 18B, 18C, and 18D are provided in the busbar chamber 24 and the cable chamber at the rear of the busbar chamber 24, as shown in FIG.

The boxes shown in Figures 1 to 11 above have many common parts, so they can be easily assembled for 1-line power reception, 2-line power reception, and 3-line power reception by adding some parts.
It can also be used as a closed switchboard that can easily accommodate a variety of specifications.

〔Effect of the invention〕

As described above, according to the first invention, in a closed power distribution board in which a power receiving circuit breaker and a plurality of power feeding circuit breakers are housed in multiple stages, a power receiving circuit breaker is connected to at least one side of the front part of a vertically provided maintenance room via a partition wall. An equipment room was set up to house the power supply circuit breaker, and a bus room and cable room were set up at the rear of this equipment room. Openings with doors were installed in the partition walls between each equipment room, the bus room, the cable room, and the maintenance room. Further, according to the second invention, in a closed power distribution board in which a power receiving circuit breaker and a plurality of power feeding circuit breakers are housed in multiple stages, the power receiving circuit breaker and the power feeding circuit breaker are installed on both sides of the front part of a vertically provided maintenance room via partition walls. By providing an equipment room that houses circuit breakers, a bus room and a cable room at the rear of this equipment room, and openings with doors in the partition walls between each equipment room, bus room, cable room, and maintenance room. It is possible to obtain a closed switchboard that allows inspection of each equipment room, cable room, and busbar room from the maintenance room, thereby reducing front and back maintenance and reducing the installation floor space.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the closed switchboard of the present invention;
FIG. 2 is a right side view of FIG. 1, FIG. 3 is a sectional view taken along line A-A in FIG. 1, and FIG. 4 is a partial rear perspective view of the closed switchboard of the present invention.
FIG. 5 is a partial front perspective view of the closed switchboard of the present invention, FIG. 6 is a front view showing another embodiment of the closed switchboard of the present invention, and FIG.
The figure is a right side view of Fig. 6, Fig. 8 is a BB sectional view of Fig. 6, a front view showing another different embodiment, and Fig. 12 is the main circuit of a conventional two-line power receiving closed switchboard. Figure 13 is a diagram showing a conventional closed switchboard, where (a) is a front view, (b) is a sectional view taken along line CC in (a), and (
c) is a sectional view taken along line DD in figure (a), and figure (d) is a cross-sectional view taken along line DD in figure (a).
It is EE sectional drawing of a). IA, IB, IC, ID...Power supply circuit breaker 3A, 3
B...Power receiving circuit breaker 4...Bus bar circuit breaker 6...Vertical switch, i! 12...Maintenance room 10, 1.1.25.29...
・Cable room 13, 14.15...Inspection door 24・
・Vertical Busbar Room (8733) Agent Patent Attorney Yoshiaki Inomata 26 Hero Figures'''1-2G (1 figure is A-A1 color) Figure 3 Figure Figure Figure Figure Figure Figure Figure (b) Diagram

Claims (2)

[Claims] (1) In a closed power distribution board in which a power receiving circuit breaker and a plurality of power feeding circuit breakers are housed in multiple stages, the power receiving circuit breaker and power feeding circuit breaker are housed at least on one side of the front part of a vertically provided maintenance room via a partition wall. A separate equipment room was established, and a bus room and cable room were installed at the rear of this equipment room.
A closed switchboard characterized in that an opening with a door is provided in the partition wall between each of the equipment rooms, the busbar room, the cable room, and the maintenance room. (2) In a closed power distribution board in which a power receiving circuit breaker and a plurality of power feeding circuit breakers are housed in multiple stages, the power receiving circuit breaker and power feeding circuit breaker are housed on both sides of the front part of a vertically installed maintenance room via a partition wall. A busbar room and a cable room are provided at the rear of the equipment room, and an opening with a door is provided in the partition wall between each of the equipment rooms, busbar room and cable room, and the maintenance room. Closed switchboard.